AUDIO CODING Russian patent published in 2008 - IPC G10L19/02 

FIELD: physics.

SUBSTANCE: substance of invention implies exclusion of common procedure of interpolation relative to filter factors and gain value for interpolated intermediate audio values, and coding can be performed not by gain value interpolation, but by power limit calculated by masking threshold value rather as area lower than square of masking threshold value for each knot, i.e. for each transferred parameterisation followed by interpolation between these power limits in adjacent knots, e.g. by linear interpolation. Both on coder side, and on decoder side, gain value can be calculated then by intermediate power limit calculated so that quantising noise caused by fixed frequency quantisation prior to followed filtration on decoder side is lower than power limit or corresponded thereto after followed filtration.

EFFECT: provided coding of tapped audio noise reduction.

16 cl, 15 dwg